Electric pipe-thawing apparatus.



' lE. c. DAVEY. ELECTBICPIPE THAWING APPARATUS.

Patented Dec. 31,1918.

.UNITED sTATEs PATENT oEEIcE.

HHETT'CLIFFORD DAVEJY, OF MANKATO, MINNESOTA, ASSIGNOR OF ONE-FBTH T0 HARRY W. BAKER, F MANKATO, 4lIINlll'lllSO'lA. v

ELECTRIC PIPE-THAWING APPARATUS.

" To all whom z'tmay concern:

land kState of y and "useful Improvements in Electric Pipel is a specification.

' arranged in accor Fig. 2 is a detail sectional view of the' by current of ordinary. voltage, as for irlstance, from the ordinary 110 volt lighting circuit, and Awhich permits bare copper wire to --be used to connect to the pipes and to be laid across streets' without danger of animals or pedestrians passing over thesame.-

VV'ith the above'an other objects. in view, the mvention consists in the construction, combinatlon and arrangement of devices 'hereinafter described and claimed.

In the accompanying drawings Figure 1 is a plan, electric thawing a paratus constructed and ance with my invention.

same. y

Fi 3 is a detail perspective view showing t e .construction of the core.

Fig. 4 is a perspective view of the same with the container indicated in dotted outl1ne. Y

In the embodiment of my invention, I provide an induction coil 1.' The core 2 of the coil comprises lamin 3 of silicon steel which, in practice, are 17 /100 of an inch in thickness and which are arranged in alternation and in overlapping relation at the corners of the core, thus forming side members 4 and end members 5 of the coreand, y

in practice, a large number of such laminas, usually about 690, are employed i-n the making of the core'. There are two sets-6, 7 of` pl'1II1 'aI'y windings on the core each consist- 1ng,'1n. practice, of about 124; turns ofNo. 10

double'cotton covered magnet wire wound in four layers; that is to say, two layers on each leg of the core with necessary insulap tion ,B between the layersr The windings 6, 7 are leads 9, 10 which ings to the source o f current. The ary windings 11VA are, in practice, composed connect the primarywind` Specication of Letters Patent. i

' of ve turns to each leg of the core.

'per 'bars 16. -bolts extend through;y openings in the top 19 and securing nuts 20 are partly in section, of an be operated by electric current This will thaw out the (prima respectively provi ed with l second- Patented Dee. 31, 191s.

appucation mea July 26,191`s. serial Nn. 246,902.

of three No, 5 double cotton covered magnet wireswound in multiple and consisting These secondary windings are connected by leads 12 to'the ipes to be thawed..

The in uction coil is arranged in a container 13 which is made of iron and the top,

bottom, side and end walls of'which are corrugwated, as shown. A w Y he corrugations mereasellthe superficial area of the container and provide a maximum cooling surface. The bottom of the container isprovided -near the corners with raised bosses 14. The laminaev ofthe'core are clamped and held together by lower and upper bars 15, 16. which are arranged across the ends of i gether by bolts 17 the lower ends of which the core and' are connected to-' are threaded in the bosses 14. Clamping nuts 18 bear on and securely hold the up- The upper portions of the of the container screwed on the upper ends of the -boltsf and bear on the top o the container and hold the same in securely closed position. The

container is filled with oilV to prevent o verheating and also vto insure better insulation.

V f By the provisiongofthe two setsof rimary. windings the apparatus'isadapte to of dilferent voltages. The leads 9, 10 enable the primary windings to be connected to conductors charged with current at either 110 or 220 volts. 220 volts should only be used on long runs and for not more than about 1 hour on account'of heating. 110 volts may be used oneitherof the primary windings indefin itely without any harmful effects occasioned by heating.

First locate freeze as nearly-as possible.

Connect one secondary wire at one end of pipe, andthe othersecondary wire on vother end, maklng a circuit as short as possible. pipe between 'points connected. l In cases where, what" is knownas the service main leading from the building to the main, is frozen, the connection 1s made through the shut-0E.

Silicon steel is used Vin the apparatus to,

secure greater permeability. The current passes through the` circuit 'which is formed causing the`frozen portion to thaw, and the sameholds of frozen gas pipes.

Having thus described my invention, I claim-:- f

1/L An electric thawing apparatus comprising an induction coil having a core composed of superposed members, cross bars on opposite sides of the core, a container in whic the induction coil is arranged,- said container having a removable cover, and bolts extending t rough Vthe cross bars, and through the cover of the container and provided with means to clamp the cross bars on the core and to also secure the coil andthe cover in place.

2. In electric thawing apparatus of the class described, a container having a removable cover, an induction coil arranged in the container and having a core composed of laminae of silicon steel arranged in alternating and partially overlapping relation, cross bars extending across the ends of the core and between which the laminae are arranged and bolts extending through said cross bars and clamping the core laminae therebetween,

the said bolts being attached to the bottom of the container and extending through the openings in the cover thereof and clamping nuts on also Securing the latter in In testimony whereof I a i EMMETT CLIFFORD DA lace. x my si'o'nature.

the bolts bearing on lthe cover and. 

